CN116799355A - Thermal management system of immersed energy storage power station and control method thereof - Google Patents
Thermal management system of immersed energy storage power station and control method thereof Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 238000010438 heat treatment Methods 0.000 claims abstract description 50
- 239000000110 cooling liquid Substances 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000007613 environmental effect Effects 0.000 claims abstract description 3
- 239000000498 cooling water Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000012806 monitoring device Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000002826 coolant Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a thermal management system of an immersed energy storage power station, which comprises a liquid cooling module, a heat exchange module and a refrigerating and heating module; the control method of the thermal management system of the submerged energy storage power station is also disclosed, and comprises the following steps: judging the running state of the energy storage power station, and detecting the environmental temperature of the energy storage power station when the energy storage power station is in a charging or discharging state; comparing the environment temperature with a preset temperature, and controlling the refrigerating and heating module to be in a refrigerating mode, a heating mode or maintain the original state; and detecting the temperature of the battery pack, the temperature of the battery core and the temperature of inlet and outlet liquid of the battery pack in different modes, and controlling the operation frequencies of the compressor and the pump according to preset threshold judgment conditions. According to the invention, the battery is directly immersed in the cooling liquid, the battery is cooled by the cooling liquid, a heat dissipation channel does not need to be reserved to save occupied space, meanwhile, the self-consumption cost of the energy storage system can be reduced, the chain reaction of the battery after thermal runaway can be restrained, and the safety of the energy storage power station is improved.
Description
Technical Field
The invention relates to the technical field of energy storage heat management, in particular to a thermal management system of an immersed energy storage power station and a control method thereof.
Background
In a new energy revolution, how to effectively inhibit the intermittence and fluctuation of new energy power generation and improve the stability of large-scale grid-connected power generation of new energy becomes a key problem. In order to achieve load balancing of a renewable energy-based power system, energy storage will become a key support technology. The development and application of the energy storage technology are beneficial to stabilizing the fluctuation of a new energy power grid, promoting the consumption of renewable energy sources and promoting the replacement of main energy sources from fossil energy sources to renewable energy sources. However, with the rapid development of energy storage power stations, the safety problem of the energy storage power stations is increasingly prominent, and the importance of energy storage heat management and fire control is increasingly prominent. The energy storage power station needs more safety of the focusing energy storage power station, eliminates thermal runaway of the battery, and provides better uniform heat dissipation of the battery. In the prior art, air cooling is often adopted, along with the improvement of battery capacity and power, under a high-power charge-discharge scene or a complex working condition, the problem of battery heat dissipation is difficult to solve by an air cooling technical scheme, a heat dissipation channel needs to be reserved, the occupied space of a large energy storage project is enlarged, an air cooling system indirectly cools a battery cell through cooling air, and the whole energy storage system generates great self-consumption electricity.
The invention discloses a 'battery energy storage system with efficient air cooling and heat dissipation' in Chinese patent literature, which has the publication number of CN113140829A and the publication date of 2021-07-20, wherein each battery module is respectively connected with one DC-DC module, all DC-DC modules are connected in parallel and then are connected with a battery management module, the battery management module is connected with a DC-AC module, and the DC-AC module is connected to an external power grid; the battery module comprises a plurality of battery groups arranged in the energy storage container, each battery group comprises a plurality of battery monomers, and each battery group is arranged in an air cooling box body; the air cooling box body is internally provided with a plurality of temperature sensors, the temperature sensors are connected with the battery management module, the air cooling box body is provided with an air inlet and an air outlet, the air conditioning device is connected with each air inlet through an air supply pipeline, the air supply pipeline is provided with an air supply device, and each air outlet is connected to an air outlet pipeline. The technology can improve the consistency of the temperature of the battery monomer in the energy storage system, but the defect of an air cooling technology still exists, namely, a heat dissipation channel needs to be reserved, so that the occupied space of a large-scale energy storage project is increased, and the air cooling system indirectly cools the battery cell through cooling air, so that the whole energy storage system has high power consumption.
Disclosure of Invention
The invention aims to solve the problems that an air cooling energy storage system is large in occupied space and the self-power consumption of the energy storage system is high due to the fact that cooling air is used for detecting and cooling a battery core in the prior art, and provides a thermal management system of an immersed energy storage power station and a control method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the submerged energy storage power station heat management system comprises a liquid cooling module, wherein the liquid cooling module comprises a plurality of battery packs submerged in cooling liquid, and each battery pack comprises a plurality of electric cores; the liquid cooling module and one end of the heat exchange module circulate cooling liquid through a liquid pump, and the other end of the heat exchange module and the refrigerating and heating module circulate cooling water through a water pump; the refrigerating and heating module comprises a compressor, and the temperature of cooling water and cooling liquid is changed through the adjustment of the frequency of the compressor; the system also comprises a control module which monitors the temperature of each module in the system and controls the operation of the system.
According to the invention, through a three-stage temperature control system, firstly, the heat exchange efficiency is improved by adjusting the operation frequency of a compressor of a refrigerating and heating module to indirectly change the temperature of cooling water so as to change the temperature of cooling liquid, or the heat exchange rate of the cooling water and the cooling liquid is improved by adjusting the operation frequency of a water pump so as to further change the temperature of the cooling liquid, and finally, the flow of the cooling liquid is adjusted by adjusting the operation frequency of the liquid pump so as to realize finer adjustment of the temperature of a battery; the battery is immersed in the cooling liquid, so that the liquid can directly cool the battery to dissipate heat of the battery, and meanwhile, the chain reaction of the battery after thermal runaway is restrained, the risks of ignition and explosion of the battery energy storage are eliminated, the safety of the energy storage power station is improved, and the safety of energy storage is truly achieved.
Preferably, each of the battery packs is provided with a temperature monitoring device; the liquid cooling module and one end of the heat exchange module form a loop through a cooling liquid outlet pipe and a cooling liquid return pipe; the other end of the heat exchange module and the first heat exchanger of the refrigerating and heating module form a loop through the cooling water outlet pipe and the cooling water return pipe.
According to the invention, each battery pack is provided with a temperature monitoring device for detecting the temperature of the battery pack, the temperature of an electric core in the battery pack, the temperature of inlet and outlet liquid of the battery pack and the like, so that the control module can conveniently adjust the operating frequency of the compressor and the liquid pump according to the acquired temperature data; the heat exchange module is used for carrying out heat exchange between the cooling liquid and the cooling water.
Preferably, the first heat exchanger of the refrigerating and heating module is respectively communicated with one end of the expansion valve and the first end of the four-way reversing valve, the other end of the expansion valve is communicated with one end of the second heat exchanger, the other end of the second heat exchanger is communicated with the third end of the four-way reversing valve, and a compressor is connected between the second end and the fourth end of the four-way reversing valve.
In the invention, the refrigerating and heating module has two conditions of a refrigerating mode and a heating mode, the temperature of cooling water can be changed by selecting refrigeration or heating according to actual conditions, the first heat exchanger is used for heat exchange between the cooling water and the refrigerating and heating module so as to change the temperature of the cooling water, and the second heat exchanger is used for heat exchange between circulating liquid in the refrigerating and heating module and the outside.
A control method of a thermal management system of an immersed energy storage power station, comprising:
judging the running state of the energy storage power station, and detecting the environmental temperature of the energy storage power station when the energy storage power station is in a charging or discharging state;
comparing the environment temperature with a preset temperature, and controlling the refrigerating and heating module to be in a refrigerating mode, a heating mode or maintain the original state;
and detecting the temperature of the battery pack, the temperature of the battery core and the temperature of inlet and outlet liquid of the battery pack in different modes, and controlling the operation frequencies of the compressor and the pump according to preset threshold judgment conditions.
In the invention, firstly, the mode is judged and selected by detecting the ambient temperature of the energy storage power station, if the ambient temperature is smaller than or equal to the first preset temperature, the temperature is lower, so that heating is performed, if the ambient temperature is larger than or equal to the second preset temperature, the temperature is higher, so that cooling is performed, and if the ambient temperature is between the two temperatures, the operation mode does not need to be changed; after the operation mode of the thermal management system is determined, the battery temperature in the cooling liquid is further adjusted step by step, and the operation frequency of the compressor and the pump (comprising a liquid pump and a water pump) is adjusted proportionally, so that the accurate adjustment and control of the battery temperature and the temperature difference of each battery are realized.
Preferably, when the ambient temperature T h Greater than or equal to a second preset temperature T M When the battery pack enters a refrigeration mode, comparing the operation frequency of the compressor corresponding to the highest temperature of the battery packWith compressor refrigeration frequency threshold f m Is of a size of (2);
when (when)When the compressor is up-converting +.>f 0 Rated operating frequency for the compressor;
when (when)Judging whether the battery cell temperature difference judging conditions and the battery pack temperature difference judging conditions are met at the same time; and if so, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
In the invention, a general compressor operates on a comfortable frequency under the normal working condition, in a refrigeration mode, when the operation frequency of the compressor corresponding to the highest temperature of a battery pack is smaller than or equal to a refrigerating frequency threshold value of the compressor, the compressor needs to be increased, the temperature is increased according to proportion adjustment on the basis of the comfortable frequency, the temperature unit in the invention adopts the temperature, meanwhile, the highest operation frequency limit exists after the frequency is increased, and if the highest operation frequency limit is exceeded, the possible fault needs to be detected manually; when the compressor does not need to raise the frequency, further judgment on the inlet and outlet liquid of the battery pack and the temperature of the battery cell can be performed; the preliminary adjustment of the temperature can be achieved by indirectly changing the temperature of the cooling liquid through the adjustment of the operating frequency of the compressor.
Preferably, when the ambient temperature T h Less than or equal to a first preset temperature T N When the battery pack enters a heating mode, comparing the operation frequency f of the compressor corresponding to the lowest temperature of the battery pack min(An) And compressor heating frequency threshold f n Is of a size of (2);
when (when)When the compressor is up-converting +.>f 0 Rated operating frequency for the compressor;
when (when)Judging whether the battery cell temperature difference judging conditions and the battery pack temperature difference judging conditions are met at the same time; and if so, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
According to the invention, when the operation frequency of the compressor corresponding to the lowest temperature of the battery pack is smaller than or equal to the threshold value of the heating frequency of the compressor in the heating mode, the frequency needs to be increased, and the frequency is increased by proportional adjustment from the comfort frequency in the same condition as in the cooling mode; the difference between the frequency threshold judging condition and the frequency raising frequency calculating mode in the process of the frequency adjusting control in the heating mode and the refrigerating mode is that the steps of further judging the inlet and outlet liquid of the battery pack and the temperature of the battery cell are the same.
Preferably, the cell temperature difference judging condition is: the difference between the highest temperature and the lowest temperature of the battery cells in the same battery pack is smaller than or equal to a battery cell temperature difference threshold; the temperature difference judging conditions of the battery pack are as follows: the difference between the highest temperature and the lowest temperature of the battery pack is less than or equal to the battery pack temperature difference threshold.
The invention provides a battery cell temperature difference judging condition and a battery pack temperature difference judging condition, which aim to check whether cooling effects of each battery pack in cooling liquid and each battery cell in the battery pack are uniform or not, and if a certain battery pack exists or the temperature of the certain battery cell is far higher than that of other battery packs or battery cells, potential failure risks exist in an energy storage system, so that the reasons of temperature difference generation are required to be further detected and processed.
Preferably, when the cell temperature difference judgment condition and the battery pack temperature difference judgment condition cannot be satisfied at the same time, the inlet liquid temperature A of any one battery pack is judged x,in With outlet liquid temperature A x,out Whether the difference of the temperature difference of the inlet and the outlet is greater than or equal to a threshold T t ；
If yes, raising the operating frequency of the pumpf 0 ′ Is the rated operating frequency of the pump;
and if not, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
According to the invention, whether further temperature control is needed by adjusting the operating frequency of the pump is determined by judging the temperature difference of the inlet and outlet liquid of the battery pack, when the temperature difference of the inlet and outlet liquid is large, the heat exchange rate between the battery pack and the cooling liquid is high, and the heat dissipation requirement of the battery pack is possibly not met under the current operating frequency of the pump, so that the operating frequency of the pump is required to be increased to increase the cooling liquid flow, and thus the heat exchange rate is indirectly increased to increase the heat dissipation speed; the temperature condition of the battery cells in the battery pack can be detected again at intervals after the operating frequency of the pump is raised, and the operating frequency of the pump is further adjusted according to the temperature.
The invention has the following beneficial effects: the battery is directly immersed in the cooling liquid, the battery is cooled through the cooling liquid, a heat dissipation channel is not required to be reserved to save the occupied space, meanwhile, the self-consumption cost of the energy storage system can be reduced, the chain reaction after the thermal runaway of the battery can be restrained, the risks of ignition and explosion of the energy storage of the battery are eliminated, and the safety of the energy storage power station is improved; the operation mode and the operation frequency of the compressor and the pump can be flexibly adjusted along with the ambient temperature and the battery temperature monitored in the operation process in the thermal management system, so that the energy consumption of the operation of the liquid cooling system is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a thermal management system for a submerged energy storage power station in accordance with the present invention;
FIG. 2 is a schematic diagram of a cooling and heating module according to the present invention;
FIG. 3 is a flow chart of a method of controlling a thermal management system of an submerged energy storage power station in accordance with the present invention
In the figure: 1. a liquid cooling module; 11. a battery pack; 111. a battery cell; 12. a cooling liquid outlet pipe; 13. a cooling liquid return pipe; 2. a heat exchange module; 22. a cooling water outlet pipe; 23. a cooling water return pipe; 3. a refrigerating and heating module; 31. a compressor; 32. a first heat exchanger; 33. a second heat exchanger; 34. an expansion valve; 35. a four-way reversing valve; 36. a liquid storage tank; 37. a filter; 38. a temperature sensor.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1 and 2, a thermal management system of an immersed energy storage power station comprises a liquid cooling module 1, wherein the liquid cooling module 1 comprises a plurality of battery packs 11 immersed in cooling liquid, and each battery pack 11 comprises a plurality of battery cells 111; the liquid cooling module 1 and one end of the heat exchange module 2 circulate cooling liquid through a liquid pump, and the other end of the heat exchange module 2 and the refrigerating and heating module 3 circulate cooling water through a water pump; the refrigerating and heating module 3 includes a compressor 31, and changes the temperatures of the cooling water and the cooling liquid by adjusting the frequency of the compressor 31; a control module (not shown) is also included to monitor the temperature of the various modules within the system and to control the operation of the system.
Each battery pack 11 is provided with a temperature monitoring device; the liquid cooling module 1 and one end of the heat exchange module 2 form a loop through a cooling liquid outlet pipe 12 and a cooling liquid return pipe 13; the other end of the heat exchange module 2 and the first heat exchanger 32 of the refrigerating and heating module 3 form a loop through the cooling water outlet pipe 22 and the cooling water return pipe 23. A liquid pump, a temperature sensor, a manual valve, a solenoid valve, a pressure sensor, etc. may be provided to the coolant liquid outlet pipe 12 and the coolant liquid return pipe 13, and a water pump, a temperature sensor, a check valve, a manual valve, a solenoid valve, a pressure sensor, etc. may be provided to the coolant water outlet pipe 22 and the coolant liquid return pipe 23.
The first heat exchanger 32 of the refrigerating and heating module 3 is respectively communicated with one end of the expansion valve 34 and the first end of the four-way reversing valve 35, the other end of the expansion valve 35 is communicated with one end of the second heat exchanger 33, the other end of the second heat exchanger 33 is communicated with the third end of the four-way reversing valve 35, and the compressor 31 is connected between the second end and the fourth end of the four-way reversing valve 35. A liquid storage tank 36 and a filter 37 are connected in series between the first heat exchanger 32 and the expansion valve 34, another filter 37 is connected in series between the expansion valve 34 and the second heat exchanger 33, fan acceleration heat exchange is arranged at the second heat exchanger 33, the first heat exchanger 32 is respectively connected with the cooling water outlet pipe 22 and the cooling water return pipe 23, and a temperature sensor 38 is arranged to detect temperature.
According to the invention, through a three-stage temperature control system, firstly, the heat exchange efficiency is improved by adjusting the operation frequency of a compressor of a refrigerating and heating module to indirectly change the temperature of cooling water so as to change the temperature of cooling liquid, or the heat exchange rate of the cooling water and the cooling liquid is improved by adjusting the operation frequency of a water pump so as to further change the temperature of the cooling liquid, and finally, the flow of the cooling liquid is adjusted by adjusting the operation frequency of the liquid pump so as to realize finer adjustment of the temperature of a battery; the battery is immersed in the cooling liquid, so that the liquid can directly cool the battery to dissipate heat of the battery, and meanwhile, the chain reaction of the battery after thermal runaway is restrained, the risks of ignition and explosion of the battery energy storage are eliminated, the safety of the energy storage power station is improved, and the safety of energy storage is truly achieved.
According to the invention, each battery pack is provided with a temperature monitoring device for detecting the temperature of the battery pack, the temperature of an electric core in the battery pack, the temperature of inlet and outlet liquid of the battery pack and the like, so that the control module can conveniently adjust the operating frequency of the compressor and the liquid pump according to the acquired temperature data; the heat exchange module is used for carrying out heat exchange between the cooling liquid and the cooling water.
In the invention, the refrigerating and heating module has two conditions of a refrigerating mode and a heating mode, the temperature of cooling water can be changed by selecting refrigeration or heating according to actual conditions, the first heat exchanger is used for heat exchange between the cooling water and the refrigerating and heating module so as to change the temperature of the cooling water, and the second heat exchanger is used for heat exchange between circulating liquid in the refrigerating and heating module and the outside.
As shown in fig. 3, a control method of a thermal management system of an immersion energy storage power station includes:
and judging the running state of the energy storage power station, and detecting the environment temperature of the energy storage power station when the energy storage power station is in a charging or discharging state.
Comparing the environment temperature with a preset temperature, and controlling the refrigerating and heating module to be in a refrigerating mode, a heating mode or maintain the original state.
When the ambient temperature T h Less than or equal to a first preset temperature T N Entering a heating mode;
when the ambient temperature T h Greater than or equal to a second preset temperature T M Entering a refrigeration mode;
when the ambient temperature T h Is between a first preset temperature T N And a second preset temperature T M While maintaining the original state.
And detecting the temperature of the battery pack, the temperature of the battery core and the temperature of inlet and outlet liquid of the battery pack in different modes, and controlling the operation frequencies of the compressor and the pump according to preset threshold judgment conditions.
In the present inventionTaking a cluster of cells as an example, if the cell cluster A includes a plurality of cell packs, the temperature of the first cell pack is A 1 The second battery pack had a temperature of A 2 And the temperature of the nth battery pack obtained by the same is A n The method comprises the steps of carrying out a first treatment on the surface of the And the inlet liquid temperature and the outlet liquid temperature of the nth battery pack are respectively A n,in And A n,out The method comprises the steps of carrying out a first treatment on the surface of the The temperature of the ith cell in the nth battery pack is A n,i 。
When the ambient temperature T h Greater than or equal to a second preset temperature T M When the battery pack enters a refrigeration mode, comparing the operation frequency of the compressor corresponding to the highest temperature of the battery packWith compressor refrigeration frequency threshold f m Is of a size of (2);
when (when)When the compressor is up-converting +.>f 0 Rated operating frequency for the compressor; the nominal operating frequency of the compressor may be chosen to be 50Hz in common, while the comfort frequency is generally chosen to be 30Hz as the initial operating frequency of the compressor, on the basis of which the frequency is raised.
When (when)Judging whether the battery cell temperature difference judging conditions and the battery pack temperature difference judging conditions are met at the same time; and if so, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
The temperature difference judging conditions of the battery cells are as follows: the difference between the highest temperature and the lowest temperature of the battery cells in the same battery pack is smaller than or equal to a battery cell temperature difference threshold; the temperature difference judging conditions of the battery pack are as follows: the difference between the highest temperature and the lowest temperature of the battery packs within the same battery cluster is less than or equal to the battery pack temperature difference threshold.
When the temperature difference judging conditions of the battery cells and the battery pack cannot be met at the same time, judging all the electric powerInlet liquid temperature A of any battery pack in the battery packs x,in With outlet liquid temperature A x,out Whether the difference of the temperature difference of the inlet and the outlet is greater than or equal to a threshold T t ；
If yes, raising the operating frequency of the pumpf 0 ' is the nominal operating frequency of the pump; the rated operating frequency of the pump is also 50Hz in the normal case, and the pump comprises a liquid pump and a water pump;
and if not, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
After the frequency raising of the pump is completed, waiting for the operation setting time (3 minutes can be selected), detecting the temperature of the battery cell again, judging the relation between the difference between the highest temperature and the lowest temperature of the battery cell in the same battery pack and the battery cell temperature difference threshold value, and returning to continuously detect the temperature of the battery pack and the temperature of the battery cell if the difference between the highest temperature and the lowest temperature is smaller than or equal to the battery cell temperature difference threshold value; if the difference between the highest temperature and the lowest temperature is larger than the set multiple of the battery cell temperature difference threshold (such as 1.3 times of the battery cell temperature difference threshold), the liquid pump/water pump is increased to the rated operating frequency (50 Hz) to operate, and then the battery pack temperature and the battery cell temperature are returned to be continuously detected.
When the ambient temperature T h Less than or equal to a first preset temperature T N When the battery pack enters a heating mode, comparing the operation frequency f of the compressor corresponding to the lowest temperature of the battery pack min(An) And compressor heating frequency threshold f n Is of a size of (2);
when f min(An) ≤f n At this time, the compressor performs up-conversionf 0 Rated operating frequency for the compressor; the nominal operating frequency of the compressor may be chosen to be 50Hz in common, while the comfort frequency is generally chosen to be 30Hz as the initial operating frequency of the compressor, on the basis of which the frequency is raised.
When (when)Judging at the timeWhether the battery cell temperature difference judging condition and the battery pack temperature difference judging condition are simultaneously met or not; and if so, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
The temperature difference judging conditions of the battery cells are as follows: the difference between the highest temperature and the lowest temperature of the battery cells in the same battery pack is smaller than or equal to a battery cell temperature difference threshold; the temperature difference judging conditions of the battery pack are as follows: the difference between the highest temperature and the lowest temperature of the battery pack is less than or equal to the battery pack temperature difference threshold.
When the cell temperature difference judging condition and the battery pack temperature difference judging condition cannot be met at the same time, judging the inlet liquid temperature A of any one battery pack in all the battery packs x,in With outlet liquid temperature A x,out Whether the difference of the temperature difference of the inlet and the outlet is greater than or equal to a threshold T t ；
If yes, raising the operating frequency of the pumpf 0 ′ Is the rated operating frequency of the pump; the rated operating frequency of the pump is also 50Hz in the normal case, and the pump comprises a liquid pump and a water pump;
and if not, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
After the frequency raising of the pump is completed, waiting for the operation setting time (3 minutes can be selected), detecting the temperature of the battery cell again, judging the relation between the difference between the highest temperature and the lowest temperature of the battery cell in the same battery pack and the battery cell temperature difference threshold value, and returning to continuously detect the temperature of the battery pack and the temperature of the battery cell if the difference between the highest temperature and the lowest temperature is smaller than or equal to the battery cell temperature difference threshold value; if the difference between the highest temperature and the lowest temperature is larger than the set multiple of the battery cell temperature difference threshold (such as 1.3 times of the battery cell temperature difference threshold), the liquid pump/water pump is increased to the rated operating frequency (50 Hz) to operate, and then the battery pack temperature and the battery cell temperature are returned to be continuously detected.
In the invention, firstly, the mode is judged and selected by detecting the ambient temperature of the energy storage power station, if the ambient temperature is smaller than or equal to the first preset temperature, the temperature is lower, so that heating is performed, if the ambient temperature is larger than or equal to the second preset temperature, the temperature is higher, so that cooling is performed, and if the ambient temperature is between the two temperatures, the operation mode does not need to be changed; after the operation mode of the thermal management system is determined, the battery temperature in the cooling liquid is further adjusted step by step, and the operation frequency of the compressor and the pump (comprising a liquid pump and a water pump) is adjusted proportionally, so that the accurate adjustment and control of the battery temperature and the temperature difference of each battery are realized.
In the invention, a general compressor operates on a comfortable frequency under the normal working condition, in a refrigeration mode, when the operation frequency of the compressor corresponding to the highest temperature of a battery pack is smaller than or equal to a refrigerating frequency threshold value of the compressor, the compressor needs to be increased, the temperature is increased according to proportion adjustment on the basis of the comfortable frequency, the temperature unit in the invention adopts the temperature, meanwhile, the highest operation frequency limit exists after the frequency is increased, and if the highest operation frequency limit is exceeded, the possible fault needs to be detected manually; when the compressor does not need to raise the frequency, further judgment on the inlet and outlet liquid of the battery pack and the temperature of the battery cell can be performed; the preliminary adjustment of the temperature can be achieved by indirectly changing the temperature of the cooling liquid through the adjustment of the operating frequency of the compressor.
According to the invention, when the operation frequency of the compressor corresponding to the lowest temperature of the battery pack is smaller than or equal to the threshold value of the heating frequency of the compressor in the heating mode, the frequency needs to be increased, and the frequency is increased by proportional adjustment from the comfort frequency in the same condition as in the cooling mode; the difference between the frequency threshold judging condition and the frequency raising frequency calculating mode in the process of the frequency adjusting control in the heating mode and the refrigerating mode is that the steps of further judging the inlet and outlet liquid of the battery pack and the temperature of the battery cell are the same.
The invention provides a battery cell temperature difference judging condition and a battery pack temperature difference judging condition, which aim to check whether cooling effects of each battery pack in cooling liquid and each battery cell in the battery pack are uniform or not, and if a certain battery pack exists or the temperature of the certain battery cell is far higher than that of other battery packs or battery cells, potential failure risks exist in an energy storage system, so that the reasons of temperature difference generation are required to be further detected and processed.
According to the invention, whether further temperature control is needed by adjusting the operating frequency of the pump is determined by judging the temperature difference of the inlet and outlet liquid of the battery pack, when the temperature difference of the inlet and outlet liquid is large, the heat exchange rate between the battery pack and the cooling liquid is high, and the heat dissipation requirement of the battery pack is possibly not met under the current operating frequency of the pump, so that the operating frequency of the pump is required to be increased to increase the cooling liquid flow, and thus the heat exchange rate is indirectly increased to increase the heat dissipation speed; the temperature condition of the battery cells in the battery pack can be detected again at intervals after the operating frequency of the pump is raised, and the operating frequency of the pump is further adjusted according to the temperature.
The foregoing embodiments are further illustrative and explanatory of the invention, as is not restrictive of the invention, and any modifications, equivalents, and improvements made within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The submerged energy storage power station heat management system is characterized by comprising a liquid cooling module, wherein the liquid cooling module comprises a plurality of battery packs submerged in cooling liquid, and each battery pack comprises a plurality of electric cores; the liquid cooling module and one end of the heat exchange module circulate cooling liquid through a liquid pump, and the other end of the heat exchange module and the refrigerating and heating module circulate cooling water through a water pump; the refrigerating and heating module comprises a compressor, and the temperature of cooling water and cooling liquid is changed through the adjustment of the frequency of the compressor; the system also comprises a control module which monitors the temperature of each module in the system and controls the operation of the system.
2. The submerged energy storage power station thermal management system of claim 1, wherein each of the battery packs is provided with a temperature monitoring device; the liquid cooling module and one end of the heat exchange module form a loop through a cooling liquid outlet pipe and a cooling liquid return pipe; the other end of the heat exchange module and the first heat exchanger of the refrigerating and heating module form a loop through the cooling water outlet pipe and the cooling water return pipe.
3. The thermal management system of an immersed energy storage power station according to claim 1 or 2, wherein the first heat exchanger of the refrigerating and heating module is respectively connected with one end of the expansion valve and the first end of the four-way reversing valve, the other end of the expansion valve is connected with one end of the second heat exchanger, the other end of the second heat exchanger is connected with the third end of the four-way reversing valve, and a compressor is connected between the second end and the fourth end of the four-way reversing valve.
4. A method of controlling a thermal management system of a submerged energy storage power station adapted for use in a thermal management system as claimed in any one of claims 1 to 3, comprising:
judging the running state of the energy storage power station, and detecting the environmental temperature of the energy storage power station when the energy storage power station is in a charging or discharging state;
comparing the environment temperature with a preset temperature, and controlling the refrigerating and heating module to be in a refrigerating mode, a heating mode or maintain the original state;
and detecting the temperature of the battery pack, the temperature of the battery core and the temperature of inlet and outlet liquid of the battery pack in different modes, and controlling the operation frequencies of the compressor and the pump according to preset threshold judgment conditions.
5. The method of claim 4, wherein the thermal management system of the submerged energy storage power station,
when the ambient temperature T h Greater than or equal to a second preset temperature T M When the battery pack enters a refrigeration mode, comparing the operation frequency of the compressor corresponding to the highest temperature of the battery packWith compressor refrigeration frequency threshold f m Is of a size of (2);
when (when)When the compressor is up-converting +.>f 0 Rated operating frequency for the compressor;
when (when)Judging whether the battery cell temperature difference judging conditions and the battery pack temperature difference judging conditions are met at the same time; and if so, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
6. The method of claim 4, wherein the thermal management system of the submerged energy storage power station,
when the ambient temperature T h Less than or equal to a first preset temperature T N When the battery pack enters a heating mode, comparing the operation frequency of the compressor corresponding to the lowest temperature of the battery packAnd compressor heating frequency threshold f n Is of a size of (2);
when (when)When the compressor is up-converting +.>f 0 Rated operating frequency for the compressor; when->Judging whether the battery cell temperature difference judging conditions and the battery pack temperature difference judging conditions are met at the same time; and if so, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
7. The method for controlling a thermal management system of an immersion energy storage power station according to claim 5 or 6, wherein the cell temperature difference judging condition is: the difference between the highest temperature and the lowest temperature of the battery cells in the same battery pack is smaller than or equal to a battery cell temperature difference threshold; the temperature difference judging conditions of the battery pack are as follows: the difference between the highest temperature and the lowest temperature of the battery pack is less than or equal to the battery pack temperature difference threshold.
8. The method according to claim 5 or 6, wherein when the cell temperature difference judgment condition and the battery pack temperature difference judgment condition cannot be satisfied at the same time, the inlet liquid temperature a of any one battery pack is judged x,in With outlet liquid temperature A x,out Whether the difference of the temperature difference of the inlet and the outlet is greater than or equal to a threshold T t ；
If yes, raising the operating frequency of the pumpf 0 ′ Is the rated operating frequency of the pump;
and if not, returning to continuously detecting the temperature of the battery pack and the temperature of the battery cell.
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| CN117254157A (en) * | 2023-09-26 | 2023-12-19 | 福建时代星云科技有限公司 | Liquid cooling heat management method and system |
| CN117423930A (en) * | 2023-10-25 | 2024-01-19 | 广州高澜节能技术股份有限公司 | Energy storage cooling device and control method and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117254157A (en) * | 2023-09-26 | 2023-12-19 | 福建时代星云科技有限公司 | Liquid cooling heat management method and system |
| CN117423930A (en) * | 2023-10-25 | 2024-01-19 | 广州高澜节能技术股份有限公司 | Energy storage cooling device and control method and system thereof |
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